docs: def set_digit_raw(self, pos, bitmask):
          """Set digit at position to raw bitmask value.  Position should be a value
          of 0 to 3 with 0 being the left most digit on the display."""
          if pos < 0 or pos > 3:
              # Ignore out of bounds digits.
              return
          # Set the digit bitmask value at the appropriate position.
          # Also set bit 7 (decimal point) if decimal is True.
          self.buffer[pos*2]   = bitmask & 0xFF
          self.buffer[pos*2+1] = (bitmask >> 8) & 0xFF